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(no M6361.) S D;TORBEY,'

Pile for the Manufactiir'of Composite Plates.

No. 235,471, Patented Dec. 14,1880.

WITNESSES: V I mygmon: Q: 7. y /r/ 'B 1 I ATTORNEYS.

' UNITED STATES PATENT OFFICE.

DOLPHUS TORREY, OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 235,471, dated December 14. 1880.

' Application filed April 22, 1880. (No model.)

To all whom it may concern Be it known that I, DoLPHUs TORREY, of the city, county, and State of New York, have invented a new and Improved Pile of Iron and Steel for the Manufacture of Composite Plates or Bars, of which the following is a specification.

This invention relates to the protection of the metal forming the interior of the pile from the action of oxidizing flames and gases while in the heatingfurnace and immediately subsequent thereto.

The object of my invention is to so shape the pieces of metal forming the box or case of the pile that no bands, ties, bolts, or rivets will be required to keep the separate pieces in V pile.

Heretofore piles for similar purposes have been made by constructing their cases of separate pieces of iron, usually six in number, which required the use of bands,ties, bolts, or rivets to keep them in position on or around the pile. Such provisions for incasing the interior mass of metal are, however, expensive, troublesome to apply, and often detrimental to the product.

of pile oxygen is practically excluded from the contained steel while in the furnace and during the subsequent manipulations.

In the heating of this pile in the furnace a chemical action takes place similar to that which occurs in the manufacture of blistersteel-namely, the combination of a portion of the carbon from the steel with the incasing iron, so that the surfaces of the iron and the steel that are in contact with each other are alike converted into a steely iron or weldsteel, that permits the perfect welding of the parts together when the pile is being formed into plates or bars.

I am aware that it is not new to make a boxpile with its sides and one end 'n a single piece but being open at the en l ccess is fun nished to the furnace-flames, so as to occasion oxidation and consequent loss. Moreover, steel-scrap cannot be worked with a pile like this, because in passing through the rolls ata welding-heat the soft steel would be forced out.

What I claim as new is-- A closed pile consisting of the plates A B, intermediate band, 0, and steelscrap D, as shown and described.

DOLPHUS TORREY.

Witnesses:

I. I. STORER, O. SEDGWICK. 

